Logan Lathe Back Gear Removal! (2023)


I go through the process of taking the Bull Gear assembly out of a 10" Logan Lathe. Should be a similar process on 9", 10", 11" and maybe some others.

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Hey guys, it's spitfire again um, I just got done working out, so I got crazy messy hair um today, I'm gonna be going through one of the great mysteries in life trying to get the back gear or the headstock of a logan lathe.

I've never done it before, but I'm gonna figure it out for you guys, so you don't have to so.

Let me show you what I'm working with and we'll get started alrighty.

So here's our lucky candidate, um first thing I want to mention, is if you haven't noticed already, my picture quality is way better.

Finally got my new camera taken great video, hopefully, but here it is what this guy is, is used to be a logan or montgomery awards.

10 inch lathe and I have already unbolted the headstock here.

But if you can look inside there you can see we got our bowl gear, here's our large gear and then our small gear in there- and I don't know you guys know how to take that.

Take that out.

I don't, but I'm gonna figure it out for you guys um.

I have yet to see a video of anybody taking these guys apart on youtube, because I was curious myself and I went searching and I found absolutely nothing.

So, let's get to it first thing: I'm gonna do get your us standard, wrenches and we're going to take this.

I don't know what they call this.

Your pull bar your your bar thingy.

That's your! I think they call it your slide, so we're going to take that guy out and there she is a little hex bolt under there.

If I can figure out what size it is I'll, let you guys know it's a eighth of an inch loosen that guy up take this collar off slide right off and this guy, hopefully, okay, lad slide right out of there.

Mine had a bunch of gunk up here, so it didn't slide out very good, but it did.

You can see kind of how that guy is set up, there's supposed to be a little retainer pin in here in this slot, but it has either been taken out or broke out.

So we'll slide this guy back together, throw it off to the side and I'm gonna go throw some gloves on, because this gets a little greasy.

So hang tight, so I was driving in my car today on my way back home and somebody pulled out in front of me.

I don't know if it was a guy or gal, but I noticed on their license plate.

It said I r n e y e and then space rn.

If you don't know what rn is registered nurse so they're an eye nurse, I think that eye nurse needed to get her eyes checked all right.

Let's get some of this stuff out of the way.

This is all stuff that you probably are going to have.

Now you probably won't have it off.

These are bolts for the the uh cover so now.

What's next is I'm not sure I'm gonna think about it? Think about it, some more and then we'll take a look-see being that already got this guy off.

I'm just gonna pull this back, so we can take a look and see what this thing looks like underneath and lo and behold we'll get a better shot here.

We got some retaining screws, so let me find my expensive, maglite and I'll zoom in here, for you guys all right if you can see it in there, there's a hex retainer bolt in there same thing on that side.

So bad news guys your sol, if you were thinking that you're gonna be able to take this guy off without um, taking your headstock off, so the headstock is gotta come off.

So let's find our correct wrench.

Actually I'm going to set this thing up on my bench, so I'm not kneeling on the floor and then I don't have it sitting on there.

So I don't scratch my bed all right.

Here's a little little better setup for you guys for me too.

So I think we checked that one.

That was not right, so good news, bad news here, guys um! Well, I don't know about the good news, but bad news is you got to take your headstock off good news? You probably don't have to take your spindle out.

You can leave that guy right in there shouldn't get in the way, so I'm not sure exactly how far we're going to unscrew that that should be more than enough and numero dos.

This is a 732nd allen, wrench by the way fyi.

So there those guys are loose, and I should just slide right out right theoretically- and I got my uh tumbler gear retainer here, so I'm just gonna take that off in case.

We need to get that out of the way, because it really doesn't need to be there at this time, as you can see, it's nice and greasy and dirty.

So, if you're going to going to be doing this, it's probably going to be nice and greasy and dirty all right.

Next step is hope and pray that something comes out.

So, let's get some, let's figure out, which way we want to go so I'm thinking we probably want to go this way.

First, I believe what you have to do is you have to push it out one way and then push it out.

The other way from everything I have never been told that's what needs to happen, and I just happen to have a little piece of brass here, because they made me buy a little hunk at the store the other day when I was at the surplus place so and we're moving in the right direction.

So I'm just going to keep counting away here and I'm going in the direction of what would be the spindle.

At this point I might uh we might end up going the other way, but we'll find out.

I'm gonna try going the other way and see what happens here, and so we get stuck all right.

Plan b is what I'm gonna do is take a screwdriver, and I know I actually probably didn't see that I didn't pry on it.

I just pushed it there's this bushing here and we'll push it back in see there.

This is okay, here's our heads or here's our spindle side, where our chuck would be and here's our little bushing and I'm not prying on it- I'm just pushing it.

So just push pull this out and push a little further and grab and twist and swear and grunt and wonder why we're getting crap, okay, okay, so I'll see if I can get this in there and I'm running out of room there.

So so what I can tell you now is there's this rides on a shaft in here.

There's a capped bear uh.

This is bearing bushing whatever you want to say, and then there's also a open-ended bushing on this end, which we'll pull out here in a second.

So, let's see now the trick is.

I got to grab hold of this, and here there we go twist turn pull it out, see it's a a capped off bronze bushing in there see we're making progress all right so now.

What I believe we can do is push our piston on and what I'm gonna do is not our piston but our shaft, and these sorry these cords annoying for you guys so on our what would be the uh outside spindle here with all the chain gears and everything wrap.

If you have change gears, there's an open-ended bushing in there and I'm gonna push with this dowel and push this shaft out, while I'm holding my gear here.

So let's give it a shot there we go and it's an eccentric.

I forgot to mention that so here we go look at that ciao and then that just pulls out like that.

Look at that success, so here's our accent, eccentric and there's a little woodruff key there.

If you can see that guy and this little guy down here was on there too, I'm not quite sure what that's for actually, oh, you know what that guy's for that rides hold on a second, I got.

This hang tight.

This rides on our slide gear, so that's our rack and pinion whatever you want to call it so that sorry that'll turn our eccentric.

So that's why that guy's keyed, because that'll turn on the shaft and then the the back gear will spin by itself.

So there we go and then, if we want to pop this guy out, I'm not sure if it even pops out.

That's why I wasn't moving a whole hell of a lot, because that is machined on this side.

So I lied.

There is no there's a bronze bushing in there, but our shaft spot is machined here.

So, let's figure out which way we're in I'm just going to check this out and see yeah there we go so there we go and then put it back together.

You can figure it out.

It just goes back away the same.

It came when it came out and then you just got to make sure that um you do have to line this guy up when you put it back in.

You have to make sure that when you push it in this will back your assembly drops down and then, when you pull it out, it plops up into your bowl gear and your outside spindle gear.

So there we go.

Look at that.

One of the seven great mysteries of the world has been solved here tonight and there we go.

We got our for the most part, stripped down headstock um, I'm gonna take a few more parts off this guy, but there we go there.

It is success on to the next project.

Huh see that took me all like what five six seven ten minutes, but of course you, your lathe is probably sitting there all together, functioning, working and mine was pretty much stripped apart.

So good luck have fun.

No, it really wasn't that bad once you get it all apart.

One thing I forgot to mention: if you well, obviously you got to pull your headstock off, but when you do clean your bedways up extremely well and mark down here say: your bed is right here with a little razor blade or something die cam and a little scratch mark where your headstock's at, because when you put that thing back on there, you want to get it damn near as close back to normal as you can an alternative method to that would be well.

I would do that and then, on top of that, you can also put a magnetic dial indicator on your bed ways, and then you can return your headstock back to zero.

With your dial indicator.

There we go all right there, we go.

We got it apart.

We did it.

We did it um.

I hope you guys enjoyed that.

I hope you learned something because the hell, if I know how to do it, but you know these things- are extremely simple: there's, usually not much to take them apart.

Everything's standard on them go usa and uh yeah they're, pretty simple to take apart um.

If you plan on doing this, I hope that helped you because, like I said before, I had no idea how to do this.

So hopefully now you do um.

If you like.

My videos please subscribe like comment.

Ask questions if you want I'm always available to ask questions and you can always contribute if you found this helpful, every little bit helps and I always put it towards doing more crap.

So I hope you guys enjoyed check out my other videos until next time see you guys later thanks.



What is the back gear mechanism on a lathe? ›

The back gear mechanism is an additional part of the belt drive lathe. It is used to obtain a slower & wider range of spindle speeds, back gear disengagement & engagement. As the name implies, “back gear” is a gear mounted at the back of the headstock.

What is the gear used in lathe machine? ›

In lathe machine , spur gear pair in the gear box perform the most important mechanism of transmitting motion and power and reduction of the noise and vibration in this part can increase the production process and also high accurate jobs on lathe machine can be produced.

How do rear gears work? ›

The easiest way to understand the operation of the rear gears is to think of them as mechanical levers. They provide a mechanical leverage that multiplies torque to help the power of the engine move the car. As the gear ratio becomes numerically higher, the gears offer more leverage to assist in acceleration.

What is the mechanism of reverse gear? ›

The reverse gear mechanism includes a reverse drive gear supported on the first shaft, a reverse driven gear supported on the second shaft, and an idle gear assembly interposed in meshing relation between the reverse drive and driven gears.

How many gears does a lathe have? ›

It consists of 3 gears arranged in a simple gear train, mounted on a bracket. The driving gear on the spindle drives the fixed stud gear, and, since they have the same speed, they must be of the same size.

Where is the gear train placed in a lathe machine? ›

The headstock of a centre lathe contains a complex gear train and many of the individual gears are compound gears. This arrange allows the speed of the lathe to be adjusted so that the chuck of the lathe rotates at the correct speed for the metal being turned/machined.

What is each gear used for? ›

Remember each car will be geared slightly differently, but a good rule of thumb for changing gears is that first gear is for speeds up to 10 mph, second gear is for speeds up to 15 mph, third gear is for speeds up to 35 mph, fourth gear is for speeds up to 55 mph, fifth gear is for speeds up to 65 mph, and sixth gear ...

How do you calculate rear gear? ›

Technical Support. Count the number of teeth on the pinion gear and count the number of teeth on the ring gear. Divide the ring gear teeth number by the number of teeth on the pinion. The result is your gear ratio.

How do gears work for dummies? ›

Gears are wheels with teeth that slot together. When one gear is turned the other one turns as well. If the gears are of different sizes, they can be used to increase the power of a turning force. The smaller wheel turns more quickly but with less force, while the bigger one turns more slowly with more force.

What is rear gear ratio? ›

This ratio refers to the number of teeth on the ring – i.e., driven gear – divided by the number of teeth on the pinion – i.e., the drive gear. Therefore, this implies that a ring gear with 41 teeth and a pinion with ten teeth results in 4.10:1.

Why is reverse gear hard to shift? ›

It often happens because the clutch is out of adjustment and doesn't allow one of the two transmission shafts to stop fully. It can also occur if you try to shift too quickly into reverse, because the shafts can take about one second to stop. A warped clutch plate will also cause this problem.

Why is reverse gear the strongest? ›

Why is the reverse gear the strongest? Because contrary to what movies would have you believe, you do not go fast in reverse gear. This means reverse gear has the lowest ratio, so also has the highest torque.

What speed do you part off a lathe? ›

Part-off Surface Speed

When parting on a manual machine, the parting tool should generally be run at approximately 60% of the recommended surface speed for the same workpiece/cutting tool materials (like all manual machining operations).

What speed should a lathe be? ›

The wood lathe speed rule of thumb is – do not to exceed 1,000 RPMs. One thousand RPMs seems to be a magical point at which bowl blanks either go up or down if they come off the lathe. If the speed is under 1,000 RPMs, then a dislodged bowl blank is supposed to fall to the floor.

How fast does a lathe need to spin? ›

Calculate the right speed

For example, a 3 inch diameter work piece would result in a speed of between 2000 and 3000 rpm and for a 10 inch diameter work piece the speed would be between 600 and 900rpm. If you want to keep this simple, just use divide into 6000 (ignore the 9000 bit!).

What is the formula for gear ratio? ›

Students derive the formula for finding the gear ratio of a pair of gears: gear ratio = teeth in driven gear/teeth in driver gear.

What is the first gear in a gear train called? ›

The simplest example of a gear train has two gears. The "input gear" (also known as drive gear) transmits power to the "output gear" (also known as driven gear).

What size are the gears on a lathe? ›

A standard change gear set is: 20, 24, 32, 36, 38, 40, 44, 48, 52, 54, 56, 60 and 80.

What is the 3 gear for? ›

When drivers are in an automatic vehicle, park and drive will get a lot of play, and reverse is important when parking, but what about the second and third gears? Or “L”? Each of these is designed for out-of-the-ordinary driving, including driving up or down steep inclines (think: mountains) or towing.

Which gear is most powerful? ›

First gear provides the most pulling power but the least potential for speed, whilst fifth gear which provides the least pulling power allows the greatest range of speed. The following table indicates typical speed and revs for changing gears up or down.

What is 1st gear used for? ›

Gear 1 is used when you're starting from a complete stop. When you're at a stoplight, and the light turns green, you'll put your foot on the gas pedal, and the car will slowly start to move forward.

What are the different mechanism in lathe? ›

It operates on the principle of a rotating work piece and a fixed cutting tool. The cutting tool is feed into the work piece which rotates about its own axis causing the workpiece to form the desired shape. Tumbler gear reversing mechanism • Quick-change gearbox. Tumbler gear quick-change gearbox.

What is the back bone of the lathe? ›

Bed: The bed is the base and backbone of a lathe where the headstock and the tailstock are located at either end of the bed. Carriage rests over the bed and slides over it.

What are the parts of a gear mechanism? ›

A gear can be very complex, but the most common ones have three distinct parts: the toothed crown, which transfers the movement, the bearing, where a shaft (of a motor or another part of the mechanism) is coupled, and the partition between them, which sometimes appears in the form of arms.

Which part of lathe holds the driving pulleys and back gears? ›

Headstock: The headstock is usually located on the left side of the lathe and is equipped with gears, spindles, pulleys, chucks, gear speed control levers, and feed controllers.

What are the 3 basic lathe operations used in lathe? ›

The most common lathe operations are turning, facing, grooving, parting, threading, drilling, boring, knurling, and tapping.

What are the five 5 main parts of a lathe machine? ›

While there are different types of lathes, most feature a few basic parts to facilitate their operations.
  • Bed. The bed is a large horizontal structure or beam that's used to support other parts of a lathe like the headstock and tailstock. ...
  • Headstock. ...
  • Tailstock. ...
  • Carriage. ...
  • Legs. ...
  • Cross Slide. ...
  • Saddle. ...
  • Apron.
May 9, 2019

What are the 3 main types of lathe? ›

Types of Lathes Simplified
  • Speed Lathe. Used primarily for woodturning, metal spinning and polishing, a speed lathe is a high-speed spindle used to make everything from bowls and baseball bats to furniture parts. ...
  • Engine Lathe. ...
  • Turret Lathes. ...
  • Tool Room Lathe. ...
  • CNC Lathes.
Jun 30, 2020

Why is it called a lathe? ›

One of the key characteristics of this machine was that the workpiece was turning as opposed to the tool, making it technically a lathe.

Why do wood lathes have reverse? ›

A reverse switch on a lathe allows for easier bowl work and better sanding on both bowls and spindles.

What is the chuck on a lathe called? ›

Soft (Machinable) Lathe Chuck jaws are used for holding a workpiece while turned on a lathe. They are made of soft materials such as aluminum or mild steel and can be machined to precise specifications for accurately aligning the workpiece during an operation.

What are the 4 types of gears? ›

There are many types of gears such as spur gears, helical gears, bevel gears, worm gears, gear rack, etc.

What are the 5 types of gears? ›

Read on to learn the different types of gear and the applications and industries that utilize them.
  • Spur Gear. Spur gears transmit power through shafts that are parallel. ...
  • Helical Gear. ...
  • Double Helical Gear. ...
  • Herringbone Gear. ...
  • Bevel Gear. ...
  • Worm Gear. ...
  • Hypoid Gear.

What is a simple gear mechanism? ›

2.4 Simple gears

A simple gear train uses two gears, which may be of different sizes. If one of these gears is attached to a motor or a crank then it is called the driver gear. The gear that is turned by the driver gear is called the driven gear.

Which of the following gear train is used in lathe back gears? ›

The epicyclic gear trains are used in the back gear of lathe, differential gears of the automobiles, hoists, pulley blocks, wrist-watches, etc.

What is the part of a lathe that holds the dead center called? ›

Drive center

It consists of a dead center surrounded by hardened teeth, which bite into a softer workpiece allowing the workpiece to be driven directly by the center.

Where is the gearbox located on a lathe? ›

torque to the headstock spindle in lathes according to the work done. Usually the gearbox is placed inside the headstock.

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